chore: Don't use .subList like it's a List (appsmithorg#32238)

Instead or getting the sub-list and returning that, which would be an
instance of `ArrayList$SubList`, we instead remove the extra items in
the original `ArrayList` and return that itself.

This is because the `SubList` objects are just _views_ on the underlying
`ArrayList` object, and cannot be serialized by Hibernate directly.

app/server/appsmith-server/src/main/java/com/appsmith/server/services/ce/UserDataServiceCEImpl.java

@@ -300,7 +300,7 @@ protected List<String> addIdToRecentList(List<String> srcIdList, String newId, i
         }
         // keeping the last maxSize ids, there may be a lot of ids which are not used anymore
         if (srcIdList.size() > maxSize) {
-            srcIdList = srcIdList.subList(0, maxSize);
+            srcIdList.subList(maxSize, srcIdList.size()).clear();
         }
         return srcIdList;
     }
@@ -331,7 +331,7 @@ protected List<RecentlyUsedEntityDTO> reorderWorkspacesInRecentlyUsedOrderForUse
 
         // keeping the last maxSize ids, there may be a lot of ids which are not used anymore
         if (srcIdList.size() > maxSize) {
-            srcIdList = srcIdList.subList(0, maxSize);
+            srcIdList.subList(maxSize, srcIdList.size()).clear();
         }
         return srcIdList;
     }